[PowerShell] Enhancements to PowerShell generator

[wing328]

Description

Here are some enhancements for the PowerShell generator:

• Option to specify ClientPath (which is hard coded to "$ScriptDir....\csharp\SwaggerClient" at the moment"
• Integration tests using AppVeyor (similar to other API clients, we want to perform testings with the Petstore server (local) to ensure nothing breaks after changes)
• Review authentication support: HTTP basic, API key, OAuth2
• Add auto-generated documentation for API endpoints and models
• Update auto-genreated test files (APIs, models)
• Review README.md to see if the installation instruction, etc are clear

Swagger-codegen version

Latest master

Suggest a Fix

If anyone wants to work on these enhancements or have other suggestions on making the PowerShell generator better, please reply to let us know.

[wing328]

Added C# client Path option via #5887

cc @beatcracker

[markdepalma]

@wing328 I am looking into using the PowerShell generator. The part I'm not getting is how to set parameters for things like the authorization header and basePath at runtime here. I see how you would do this in the plain csharp and other versions, but I don't see any of the ApiClient exposed in the generated PS scripts. Outside of modifying the csharp code to hardcode these variables, how should you be doing this?